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</pre><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="doccomment">/// Slot is a single saved capture location. Note that there are two slots for</span>
<span class="doccomment">/// every capture in a regular expression (one slot each for the start and end</span>
<span class="doccomment">/// of the capture).</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">Slot</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>;

<span class="doccomment">/// RegularExpression describes types that can implement regex searching.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This trait is my attempt at reducing code duplication and to standardize</span>
<span class="doccomment">/// the internal API. Specific duplication that is avoided are the `find`</span>
<span class="doccomment">/// and `capture` iterators, which are slightly tricky.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It&#39;s not clear whether this trait is worth it, and it also isn&#39;t</span>
<span class="doccomment">/// clear whether it&#39;s useful as a public trait or not. Methods like</span>
<span class="doccomment">/// `next_after_empty` reak of bad design, but the rest of the methods seem</span>
<span class="doccomment">/// somewhat reasonable. One particular thing this trait would expose would be</span>
<span class="doccomment">/// the ability to start the search of a regex anywhere in a haystack, which</span>
<span class="doccomment">/// isn&#39;t possible in the current public API.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">RegularExpression</span>: <span class="ident">Sized</span> {
    <span class="doccomment">/// The type of the haystack.</span>
    <span class="kw">type</span> <span class="ident">Text</span>: <span class="question-mark">?</span><span class="ident">Sized</span>;

    <span class="doccomment">/// The number of capture slots in the compiled regular expression. This is</span>
    <span class="doccomment">/// always two times the number of capture groups (two slots per group).</span>
    <span class="kw">fn</span> <span class="ident">slots_len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span>;

    <span class="doccomment">/// Returns the position of the next character after `i`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// For example, a haystack with type `&amp;[u8]` probably returns `i+1`,</span>
    <span class="doccomment">/// whereas a haystack with type `&amp;str` probably returns `i` plus the</span>
    <span class="doccomment">/// length of the next UTF-8 sequence.</span>
    <span class="kw">fn</span> <span class="ident">next_after_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="self">Self</span>::<span class="ident">Text</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">usize</span>;

    <span class="doccomment">/// Returns the location of the shortest match.</span>
    <span class="kw">fn</span> <span class="ident">shortest_match_at</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="self">Self</span>::<span class="ident">Text</span>,
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>;

    <span class="doccomment">/// Returns whether the regex matches the text given.</span>
    <span class="kw">fn</span> <span class="ident">is_match_at</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="self">Self</span>::<span class="ident">Text</span>,
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="ident">bool</span>;

    <span class="doccomment">/// Returns the leftmost-first match location if one exists.</span>
    <span class="kw">fn</span> <span class="ident">find_at</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="self">Self</span>::<span class="ident">Text</span>,
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span>;

    <span class="doccomment">/// Returns the leftmost-first match location if one exists, and also</span>
    <span class="doccomment">/// fills in any matching capture slot locations.</span>
    <span class="kw">fn</span> <span class="ident">read_captures_at</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">slots</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">Slot</span>],
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="self">Self</span>::<span class="ident">Text</span>,
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span>;

    <span class="doccomment">/// Returns an iterator over all non-overlapping successive leftmost-first</span>
    <span class="doccomment">/// matches.</span>
    <span class="kw">fn</span> <span class="ident">find_iter</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>(
        <span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> <span class="self">Self</span>::<span class="ident">Text</span>,
    ) <span class="op">-&gt;</span> <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="self">Self</span><span class="op">&gt;</span> {
        <span class="ident">FindMatches</span> {
            <span class="ident">re</span>: <span class="self">self</span>,
            <span class="ident">text</span>: <span class="ident">text</span>,
            <span class="ident">last_end</span>: <span class="number">0</span>,
            <span class="ident">last_match</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="doccomment">/// Returns an iterator over all non-overlapping successive leftmost-first</span>
    <span class="doccomment">/// matches with captures.</span>
    <span class="kw">fn</span> <span class="ident">captures_iter</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>(
        <span class="self">self</span>,
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> <span class="self">Self</span>::<span class="ident">Text</span>,
    ) <span class="op">-&gt;</span> <span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="self">Self</span><span class="op">&gt;</span> {
        <span class="ident">FindCaptures</span>(<span class="self">self</span>.<span class="ident">find_iter</span>(<span class="ident">text</span>))
    }
}

<span class="doccomment">/// An iterator over all non-overlapping successive leftmost-first matches.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">&#39;t</span> {
    <span class="ident">re</span>: <span class="ident">R</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> <span class="ident">R</span>::<span class="ident">Text</span>,
    <span class="ident">last_end</span>: <span class="ident">usize</span>,
    <span class="ident">last_match</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span> <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">&#39;t</span> {
    <span class="doccomment">/// Return the text being searched.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">text</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> <span class="ident">R</span>::<span class="ident">Text</span> {
        <span class="self">self</span>.<span class="ident">text</span>
    }

    <span class="doccomment">/// Return the underlying regex.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">regex</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">R</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">re</span>
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">&#39;t</span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">usize</span>, <span class="ident">usize</span>);

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">last_end</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">text</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>() {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }
        <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">re</span>.<span class="ident">find_at</span>(<span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">last_end</span>) {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">None</span>,
            <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)) <span class="op">=&gt;</span> (<span class="ident">s</span>, <span class="ident">e</span>),
        };
        <span class="kw">if</span> <span class="ident">s</span> <span class="op">==</span> <span class="ident">e</span> {
            <span class="comment">// This is an empty match. To ensure we make progress, start</span>
            <span class="comment">// the next search at the smallest possible starting position</span>
            <span class="comment">// of the next match following this one.</span>
            <span class="self">self</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">re</span>.<span class="ident">next_after_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text</span>, <span class="ident">e</span>);
            <span class="comment">// Don&#39;t accept empty matches immediately following a match.</span>
            <span class="comment">// Just move on to the next match.</span>
            <span class="kw">if</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">==</span> <span class="self">self</span>.<span class="ident">last_match</span> {
                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>();
            }
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="ident">e</span>;
        }
        <span class="self">self</span>.<span class="ident">last_match</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>);
        <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>))
    }
}

<span class="doccomment">/// An iterator over all non-overlapping successive leftmost-first matches with</span>
<span class="doccomment">/// captures.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span>(<span class="ident">FindMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span>)
    <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">&#39;t</span>;

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span> <span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">&#39;t</span> {
    <span class="doccomment">/// Return the text being searched.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">text</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> <span class="ident">R</span>::<span class="ident">Text</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>()
    }

    <span class="doccomment">/// Return the underlying regex.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">regex</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">R</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">regex</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">FindCaptures</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span>, <span class="ident">R</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">&#39;t</span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Slot</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Slot</span><span class="op">&gt;&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>() {
            <span class="kw">return</span> <span class="prelude-val">None</span>
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">slots</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="prelude-val">None</span>; <span class="self">self</span>.<span class="number">0</span>.<span class="ident">re</span>.<span class="ident">slots_len</span>()];
        <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">re</span>.<span class="ident">read_captures_at</span>(
            <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">slots</span>,
            <span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>,
            <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span>,
        ) {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">None</span>,
            <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)) <span class="op">=&gt;</span> (<span class="ident">s</span>, <span class="ident">e</span>),
        };
        <span class="kw">if</span> <span class="ident">s</span> <span class="op">==</span> <span class="ident">e</span> {
            <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">re</span>.<span class="ident">next_after_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>, <span class="ident">e</span>);
            <span class="kw">if</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">==</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_match</span> {
                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>();
            }
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="ident">e</span>;
        }
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_match</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>);
        <span class="prelude-val">Some</span>(<span class="ident">slots</span>)
    }
}
</pre>
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